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more correct encoder, big pngs don't work yet

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YK 2024-07-10 18:47:03 +03:00
parent 5c12875e81
commit 99c4262155
4 changed files with 6 additions and 8 deletions
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14
src/encoder.rs
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@ -9,17 +9,17 @@ impl Ops {
// @TODO don't alloc here, get a mut reference and extend here
fn format (self) -> Vec<u8> {
// cast_diff
let cd = |diff: i8| cast_with_bias(diff, 2);
let cd = |diff: i8| cast_with_bias(diff, -2);
// cast_luma_green
let clg = |diff: i8| cast_with_bias(diff, 32);
let clg = |diff: i8| cast_with_bias(diff, -32);
// cast_luma_red_blue
let clrb = |diff: i8| cast_with_bias(diff, 8);
let clrb = |diff: i8| cast_with_bias(diff, -8);
match self {
Ops::Nop => vec![],
Ops::Rgb([r, g, b]) => vec![254, r, g, b],
Ops::Rgba([r, g, b, a]) => vec![255, r, g, b, a],
Ops::Index(idx) => vec![0b1111 & idx as u8],
Ops::Index(idx) => vec![idx as u8],
Ops::Run(len) => vec![(3 << 6) | (len - 1)],
Ops::Diff([dr, dg, db]) => vec![(1 << 6) | ((cd(dr) << 4) | (cd(dg) << 2) | cd(db)) ],
Ops::Luma([dr, dg, db]) => vec![(2 << 6) | clg(dg), (clrb(dr) << 4) | clrb(db)],
@ -75,7 +75,7 @@ fn encode_body (header: Header, data: &[u8]) -> Option<Vec<u8>> {
// INDEX -> DIFF -> LUMA -> RGB(A)
if known[hash] == rgba {
cur = Ops::Index(hash);
} else if let Some(ops) = diff_ops([r, g, b], [last[0], last[1], last[2]]) {
} else if let Some(ops) = diff_ops([last[0], last[1], last[2]], [r, g, b]) {
cur = ops;
} else {
cur = header.channels.ops_color(&rgba[..header.channels.num()])?;
@ -90,7 +90,7 @@ fn encode_body (header: Header, data: &[u8]) -> Option<Vec<u8>> {
}
fn encode_full (header: Header, bytes: &[u8]) -> Option<Vec<u8>> {
pub fn encode_full (header: Header, bytes: &[u8]) -> Option<Vec<u8>> {
let mut out = Vec::with_capacity(header.width as usize * header.height as usize * 4);
out.extend_from_slice(&encode_header(header)?);
out.extend_from_slice(&encode_body(header, bytes)?);
@ -103,8 +103,6 @@ fn encode_full (header: Header, bytes: &[u8]) -> Option<Vec<u8>> {
#[cfg(test)]
mod test {
use std::time::Instant;
use super::*;
#[test]